bnc#792528: Play it safe for non-Excel documents.
bnc#792528: Play it safe for non-Excel documents.

Excel is not the only one that use charts. Let's also store the static
label value to maData in case it is used for non-Excel documents.

Change-Id: I1faed76e2ff396873039bccb3e1b7dcf27aba8c6

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core